Materials Literature
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Two new glass systems based on a range of lead‐indium phosphate and lead‐scandium phosphate compositions have been developed and characterized. These glasses have a relatively high index of refraction ( n = 1.75 to 1.83) in the visible region and exhibit moderate dispersion (Abbe number ∼30). The ultraviolet absorptio…
Abstract We have developed a flash radiometry technique for the determination of the thermal diffusivity of polymer films that consists of flashing a laser pulse on the front surface of the sample and monitoring the thermal radiation from the rear surface as a function of time using an infrared detector. This method i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of isocyanate-based polymers. 2. Kinetics of the thermal dissociation of model urethane, oxazolidone, and isocyanurate block copolymersP. I. Kordomenos, J. E. Kresta, and K. C. FrischCite this: Macromolecules 1987, 20, 9, 2077–2083Publication Date (Print):S…
Stable β-Ga2O3 and α-Ga2O3:Co thin films were grown on thoroughly cleaned borosilicate glass plates by the spray pyrolysis method. The substrate temperature during growth was maintained at 350 °C and the film was then annealed in air at 350 °C for 30 min. The optical energy gaps for these films at 295 K was given as 4…
Abstract The mechanisms of hydrolysis and condensation of a silane coupling agent, γ‐methacrylo‐xypropyltrimetoxysilane (γ‐MPTS) were investigated by the use of both 13 C and 29 Si nuclear magnetic resonance (NMR) spectroscopies. The NMR peaks of the hydrolyzed monomer and condensed polymer were assigned readily. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic viscoelastic properties of ABS polymers in the molten state. 5. Effect of grafting degreeYuji AokiCite this: Macromolecules 1987, 20, 9, 2208–2213Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1 September 198…
This paper describes the theoretical analysis of Barkhausen noises initiated in two different microstructures of carbon steels, being consisted of ferrite grains with or without dispersed cementites. The Barkhausen noise is generally evaluated by its RMS value, which is the sum of induced voltage pulses caused by the…
ABSTRACT This paper evaluates the utilisation of space by epibenthic diatom cells, as a response to environmental variations. The aggregation pattern of five species of epibenthic diatoms was quantified and compared to provide evidence for the significance of cell motility as an adaptive mechanism for space occupation…
A distorted dodecahedral array of eight O atoms surround the Gd3⊕ ion in 2, the first stable adduct of an organic radical (1) and a lanthanoid ion. From the temperature-dependence of the magnetic susceptibility of 2 it can be concluded that there is a weak ferromagnetic interaction between GdIII and the unpaired elect…
Cubic BN thin films are formed in RF discharge in B 2 H 6 and N 2 at low pressures under a magnetic field to confine the plasma, for negatively self-biased substrate electrodes. Ion bombardment on the growing surface is suggested to play an important role in the formation of cubic BN. The deposited films are character…
When the sintering of a polycrystalline body is analyzed by coupling the change in interface energies and the change in total volume of the polycrystal, it is discovered that the sintering pressure is a sum of two terms, one deriving from the surface curvature of the pores and the other depending on the size of the gr…
Abstract The cure of pyromellitic dianhydride–oxydianiline polyamic acid is compared with that of a model compound, diphenylcarbamido–dicarboxy–benzene, both having been synthesized in 1‐methyl‐2‐pyrrolidinone (NMP). Laser interferometry and thermogravimetric analysis showed that, analog to the diamic acid model compo…
The clustering of carbon in the detonation regime is studied with the assumption of a diffusion-limited clustering process. The diffusion constants are determined from modified Enskog theory and the Stokes–Einstein relation. With the size dependence of the cluster energy treated with a surface term, the energy differe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and interconversion of the niobotungstic acid Nb2W4O19H3- and its anhydride and alkyl/silyl estersV. W. Day, W. G. Klemperer, and C. SchwartzCite this: J. Am. Chem. Soc. 1987, 109, 20, 6030–6044Publication Date (Print):September 1, 1987Publicatio…
The structures of phosphourus oxynitride glasses have been determined using a combination of solid‐state 31 P, 15 N, and 23 Na nuclear magnetic resonance and Raman spectroscopies. Raman spectra of model phosphazene compounds with different types of P–N bonding have been used to confirm spectral assignments. Results in…
These guidelines update and extend the charts and data summaries presented in an earlier work, Guidelines for Selection of Marine Materials, in which many of the copper alloys covered in this review were not included.
Solid state, variable temperature 15 N‐NMR studies make it possible to predict the behavior of the four N atoms and the two internal H atoms in the isomeric porphine and porphycene. The spectra of porphine indicate a statistical disorder of the internal H atoms. In the case of porphycene it can be concluded that there…
Abstract The reductive dissolution by Na-dithionite of 28 synthetic goethites and 26 hematites having widely different crystal morphologies, specific surfaces and aluminium substitution levels has been investigated. For both minerals the initial dissolution rate per unit of surface area decreased with aluminium substi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCP/MAS carbon-13 NMR spectra of the crystalline components of native cellulosesFumitaka Horii, Asako Hirai, and Ryozo KitamaruCite this: Macromolecules 1987, 20, 9, 2117–2120Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published ini…
The C KLL spectra from natural diamond, graphite, and single-crystal β-SiC have been investigated using x-ray photoelectron spectroscopy and first-derivative x-ray excited Auger electron spectroscopy (XAES). It is shown that the XAES spectra is essentially the same as that obtained with conventional AES with the added…